Coherent demodulation method for burst mode M-QAM OFDM signal

摘要

This paper proposes a coherent demodulation method for M-QAM OFDM signal operating in the burst mode. The salient features of proposed method is that two preamble symbols placing at the start of every burst frame are used both for the fast and precise detection of symbol timing and the estimation of frequency offset under the frequency selective fading environments. Furthermore, this paper proposes a simple phase tracking method with decision feedback for compensating the phase rotation of signal constellation points due to the residual frequency offset as the results proposed frequency offset estimation method. The coherent demodulator including the phase tracking method proposed in this paper offers the excellent BER performance even under severe multi-path fading environments.